After a number of months of very little activity, my poor old Omerod 1 has been pressed into hard service making face shields I have been donating to local doctors surgeries and care homes, after producing almost 150 shields, and with demand for many more, my Ormerod has stopped heating the extruder. Temperature reading appears to be correct and on the thermistor I have around 80k Ohm. On the E0_HEATER terminals I'm only getting 1.5v when the heater should be on. Any help to fix this would be greatly appreciated. https://reprap.org/forum/read.php?340,870886,870886#msg-870886 Thu, 14 May 2026 03:23:10 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?340,870886,871916#msg-871916 https://reprap.org/forum/read.php?340,870886,871916#msg-871916 dc42 Ormerod Sun, 03 May 2020 12:31:34 -0400 https://reprap.org/forum/read.php?340,870886,871910#msg-871910 https://reprap.org/forum/read.php?340,870886,871910#msg-871910
Sorry for late reply!

Congratulations on getting your 150 masks done!

I seem to remember that the original Duet pcb /PSU combination was quite noisy( lots of high level spikes,) so maybe the Mosfet used to turn on the heater has failed under the trress. I know there is a schematic and a layout of the Duet PCB somewhere. This I think is it:

[github.com]

If not have a look around:

[github.com]

Requires Kicad ( and you may need an old version) [kicad-pcb.org]

regards
Andy Little]]> kwikius Ormerod Sun, 03 May 2020 12:00:10 -0400 https://reprap.org/forum/read.php?340,870886,870990#msg-870990 https://reprap.org/forum/read.php?340,870886,870990#msg-870990 tim_h Ormerod Fri, 17 Apr 2020 13:05:33 -0400 https://reprap.org/forum/read.php?340,870886,870969#msg-870969 https://reprap.org/forum/read.php?340,870886,870969#msg-870969 tim_h Ormerod Fri, 17 Apr 2020 03:48:18 -0400 https://reprap.org/forum/read.php?340,870886,870886#msg-870886 https://reprap.org/forum/read.php?340,870886,870886#msg-870886 Temperature reading appears to be correct and on the thermistor I have around 80k Ohm. On the E0_HEATER terminals I'm only getting 1.5v when the heater should be on.
Any help to fix this would be greatly appreciated.]]> tim_h Ormerod Wed, 15 Apr 2020 15:11:15 -0400